Display device

Abstract

A heatsink made of aluminum is provided in a liquid crystal display device. A plurality of light emitting diodes are contacted to a front surface of the heatsink. A fin unit is contacted to a rear surface of the heatsink. In addition, a display panel is supported by a holding member so as to be positioned at a constant distance from the light emitting diodes. The holding member is composed of a front cover and a rear cover of the display panel, supported by the heatsink and a chassis provided between the display panel and the rear cover.

1. A display device comprising:
 a light emitting diode; 
 a display panel which displays an image by light emitted from said light emitting diode; 
 a heatsink contacted to said light emitting diode, said heatsink having a surface being entirely parallel to a surface of said display panel; 
 a holding member which is supported by said heatsink and holds said display panel so as to position said display panel and said light emitting diode at a constant distance therebetween; and 
 an optical unit, wherein said light emitting diode is provided in a plurality of numbers, some of these plurality of light emitting diodes are red light emitting diodes to emit red light, some of the others are green light emitting diodes to emit green light, and the rests are blue light emitting diodes to emit blue light, and said optical unit is for mixing lights emitted from said red diodes, green diodes, and blue diodes and guiding the same to said display panel, 
 wherein the plurality of light emitting diodes are arrayed in line, and said optical unit comprises: 
 a color-mixing light guide plate for mixing light emitted from said red diodes, green diodes, and blue diodes; 
 a reflector for folding back light emitted from said color-mixing light guide plate; and 
 an illuminating light guide plate arranged between said color-mixing light guide plate and said display panel for emitting light made incident from said reflector to the whole surface of said display panel, 
 wherein said holding member comprises: 
 a front cover covering peripheral portions of said display panel; 
 a chassis for sandwiching said display panel between said chassis and said front cover and housing said illuminating light guide plate and said color-mixing light guide plate; and 
 a rear cover for sandwiching said illuminating light guide plate and said color-mixing light guide plate between said rear cover and said chassis, and said front cover and said rear cover are connected to said heatsink. 
 
     
     
       2. The display device according to  claim 1 , wherein said heatsink is made of aluminum or an aluminum alloy. 
     
     
       3. The display device according to  claim 1 , further comprising a fin attached to said heatsink. 
     
     
       4. The display device according to  claim 3 , wherein said light emitting diode transfers heat to the fin via said heatsink. 
     
     
       5. The display device according to  claim 1 , wherein said display panel is a transmission color liquid crystal panel. 
     
     
       6. The display device according to  claim 1 , wherein said heatsink is arranged parallel to said display panel. 
     
     
       7. The display device according to  claim 1 , wherein a portion for connecting said side plate and said heatsink is also used for connecting to an external chassis. 
     
     
       8. The display device according to  claim 7 , wherein said part is a screw hole provided at side surface of said heatsink, said heatsink is fixed to said external chassis by screwing a screw of said external chassis into the screw hole.